Join Date: Aug 2006
Location: Chicago, IL, USA
I've done it several times. Short of pulling the airbox and fuel tank, it's most likely settled somewhere deep. Never to be retrieved again.
Good thing is there's almost NO WAY it can cause any damage. Nothing really moving except the stepper motor and throttle shafts. And it's unlikely to get caught up there. It just a big collection of aluminum, rubber tubes and protected electrical wiring.
I'd wager my R that as long as the airfilter and airbox were on the bike when the bolt fell, it's safe to ride.
BTW, nice weather this weekend, huh? I'm in the near western 'burbs.